Perforated metal sheets are metal sheets that have been punched or stamped with a pattern of holes, slots, or decorative shapes for both functional and aesthetic purposes. They are versatile and used in applications like ventilation, filtration, sound control, and architectural elements. This is achieved through various manufacturing methods, such as presses, laser cutters, or plasma cutters, using materials like steel, aluminum, and stainless steel. 
Common specifications for perforated metal sheets include thickness (e.g., 0.3mm–10.0mm), sheet size (e.g., 1000mm x 2000mm, 1220mm x 2440mm, or customized dimensions), and hole shapes and patterns (such as round, square, or slotted, often in a staggered or straight pattern).